聚偏氟乙烯/纤维素纳米晶复合薄膜的晶体结构研究  

Study on the crystal structure of polyvinylidene fluoride/cellulose nanocrystals composites

作　　者：胡榆婕 王海军 周欢 HU Yu-jie;WANG Hai-jun;ZHOU Huan(College of Bioresources Chemical and Materials Engineering, National Demonstration Center for Experimental Light Chemistry Engineering Education, Shaanxi University of Science & Technology, Xi′an 710021, China)

机构地区：[1]陕西科技大学轻工科学与工程学院,轻化工程国家级实验教学示范中心,陕西西安710021

出　　处：《陕西科技大学学报》2021年第2期1-8,共8页Journal of Shaanxi University of Science & Technology

基　　金：国家自然科学基金项目(21873059)。

摘　　要：纤维素纳米晶(CNC)是一种具有高长径比、高机械强度的天然纳米材料,广泛应用于食品、医药和建材等领域.本研究以微晶纤维素(MCC)为原料,通过酸解法制备出CNC,进而与聚偏氟乙烯(PVDF)共混制得PVDF/CNC复合材料.采用OM、SEM、XRD和FT-IR对比研究了CNC和MCC对PVDF的晶体结构和片晶形貌的影响规律.研究结果表明,无论低温还是高温,MCC只对α相晶体有诱导成核作用;CNC在低温结晶时也仅对α相晶体有成核作用,但在高温条件下可以诱导PVDF生成极性相,并使得PVDF的片晶形貌规整性变差.上述研究结果有望调控PVDF晶体结构并拓宽纤维素的应用领域.Cellulose nanocrystals(CNC)are a kind of natural nanomaterials with high aspect ratio and high mechanical strength.They are widely used in food,medicine,building materials and other fields.CNC was prepared by acid hydrolysis of microcrystalline cellulose(MCC)and then blended with polyvinylidene fluoride(PVDF)to prepare PVDF/CNC composites.OM,SEM,XRD and FT-IR were used to investigate the crystalline structure and lamellar morphologies of PVDF/CNC and PVDF/CMC composites,respectively.The results show that MCC can only induce the nucleation ofα-phase regardless of low or high crystallization temperatures.CNC only nucleateα-phase crystals at low temperatures,but it can induce PVDF to form polar phase at high temperatures.In addition,the regularity of PVDF lamellae became worse with the addition of CNC.The above results are expected to control the PVDF crystalline structure and broaden the application fields of cellulose in the future.

关 键 词：纤维素纳米晶 晶体结构 片晶形貌 

分 类 号：TQ314.24[化学工程—高聚物工业]